/*
 Copyright [2008] [Manuel Kraft] 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 Unless required by applicable law or agreed to in writing, software distributed under
 the License is distributed on an
 "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and limitations under the License.

Author     : cutmasta@gmail.com
 */

package org.cutmasta.ip;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import com.sun.net.ssl.TrustManagerFactory;
import com.sun.net.ssl.TrustManager;
import com.sun.net.ssl.X509TrustManager;
import org.apache.commons.logging.Log; 
import org.apache.commons.logging.LogFactory;
/**
 *
 * @author cutmasta
 */

    public class EasyX509TrustManager implements X509TrustManager
{
    private X509TrustManager standardTrustManager = null;

    /** Log object for this class. */
    private static final Log LOG = LogFactory.getLog(EasyX509TrustManager.class);

    /**
     * Constructor for EasyX509TrustManager.
     */
    public EasyX509TrustManager(KeyStore keystore) throws NoSuchAlgorithmException, KeyStoreException {
        super();
        TrustManagerFactory factory = TrustManagerFactory.getInstance("SunX509");
        factory.init(keystore);
        TrustManager[] trustmanagers = factory.getTrustManagers();
        if (trustmanagers.length == 0) {
            throw new NoSuchAlgorithmException("SunX509 trust manager not supported");
        }
        this.standardTrustManager = (X509TrustManager)trustmanagers[0];
    }

    /**
     * @see com.sun.net.ssl.X509TrustManager#isClientTrusted(X509Certificate[])
     */
    public boolean isClientTrusted(X509Certificate[] certificates) {
        return this.standardTrustManager.isClientTrusted(certificates);
    }

    /**
     * @see com.sun.net.ssl.X509TrustManager#isServerTrusted(X509Certificate[])
     */
    public boolean isServerTrusted(X509Certificate[] certificates) {
        if ((certificates != null) && LOG.isDebugEnabled()) {
            LOG.debug("Server certificate chain:");
            for (int i = 0; i < certificates.length; i++) {
                LOG.debug("X509Certificate[" + i + "]=" + certificates[i]);
            }
        }
        if ((certificates != null) && (certificates.length == 1)) {
            X509Certificate certificate = certificates[0];
            try {
                certificate.checkValidity(); 
            }
            catch (CertificateException e) {
                LOG.error(e.toString());
                return false;
            }
            return true;
        } else {
            return this.standardTrustManager.isServerTrusted(certificates);
        }
    }

    /**
     * @see com.sun.net.ssl.X509TrustManager#getAcceptedIssuers()
     */
    public X509Certificate[] getAcceptedIssuers() {
        return this.standardTrustManager.getAcceptedIssuers();
    }
}

